My understanding of FLW is that his houses are beautiful but impractical to live in. It would be great to see a comeback of his style if the problems with livability could be fixed, though in this case it seems like they couldn’t fix them all.
That's the problem. These are art pieces that barely attempt to fit the role of suitable human living spaces.
A number of these houses flood, have structural issues, or develop mold problems. Some have been demolished due to their disuse and impracticality.
Provenance is all. Once you've lost that, you're competing with everything else out there.